Support Snap package manager

[a-b]

We're considering snap as the new CF CLI distribution channel. Please write your thoughts.

What's the user value of this feature request? Linux distributions like Ubuntu leaning on snap recently.

Who is the functionality for? Linux users who prefer https://snapcraft.io/

How often will this functionality be used by the user? During the installation on the relevant system.

Who else is affected by the change? Not applicable

Is your feature request related to a problem? Please describe. As an Ubuntu user, I want to install cf cli via snap.

Describe the solution you'd like Publish CF CLI releases on https://snapcraft.io/